Mullion part



FIG. 1 is a front elevational view of a mullion part showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof; and,

FIG. 6 is a cross-sectional view taken along line 6--6 of FIG. 3, the broken line showing of adjacent structures are for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a mullion part, as shown and described. 